Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2005-04-26
2005-04-26
Gary, Erika (Department: 2681)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S436000, C455S431000
Reexamination Certificate
active
06885863
ABSTRACT:
A system and method for carrying out a hand-off of a satellite-based communications link with a mobile platform, such as an aircraft, leaving a first coverage region and entering a second coverage region. A land-based communications link connects ground stations in each of the coverage regions for communications with one another and also with a network operations center (NOC). As the aircraft enters an area of overlap between the two coverage regions, a sequence of communications is initiated between the ground stations and also between each of the ground stations and the aircraft to ensure that new forward link and return link assignments are received by the aircraft before the aircraft relinquishes its communications link with the first ground station to begin communicating with the second ground station. The hand-off in communications is accomplished in less than approximately 30 seconds of time after one of the ground stations detects that the aircraft has entered a pre-defined overlap area between the two coverage regions.
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International Search Report dated Aug. 31, 2001 for PCT/US02/23792, 7 pages.
Hellman Richard A.
Parkman David S.
Stephenson Gary V
Gary Erika
Harness & Dickey & Pierce P.L.C.
Smith S.
The Boeing Company
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